low/ultra low sulfer fuel??

I used to run LSD through an '08 isx all the time and never had any problems a couple of years back when the dpf's came out and were new. The company didnt care when i asked about so i just fueled and didnt sweat it. A buddy of mine that hauls fuel as of about 6 months ago said lsd was still available then. It's real close to the cutoff date but i'll have to check with him on that and see. I still get lsd whenever possible even if it's a few pennies more per gallon for my old motor.

 

the sulfur won't make more soot. the dpfs have unique coatings just like in catalytic converters. 1) you might not pass emissions because the coatings help convert NO and NO2. 2) long term it will ruin the coating. the coating helps get the DPF very hot inside, so without the coating it gets harder to burn off the soot. 3) when that coating breaks down its harder to complete a moving regeneration because the engine might not be able to get the temps hot enough. eventually it could even be hard or impossible to do a parked regen

 

All MAJOR truck stops have switched to ULSD, except the infamous Pilots, they still have a large number of sites with only 2-3 pumps ULSD, and a number of sites that don't have it at all, and upon questioning, they won't until 01/2011, AGAIN....lol

What has to be done to run ULSD successfully in a 2005 Frieghtliner w/detroit 60. I've heard filter problems abound, any other problems to look for?

 

I've heard condensation and algae in the tanks is more of a problem with ULSD. Your filter plugging up should only be a short term problem once a few tankfuls of ULSD cleans your system out. I only run it as a last option. Knock on wood my filters havent plugged yet. I wish a person could buy a sulpher additive for it but that wouldnt be legal so it'll never happen. Too bad the tree huggers couldnt have left well enough alone...

 

I would agree with rollin coal that algae is more of a problem with ULSD. I ran into a problem with that. I think is can be especially a problem with the Cummins engines because they return a high volume of real hot fuel to the tanks. I installed a device in the line called Algae-X. Wasn't a cheap fix (about $300), but it sure cleared up the problem. I also use a product called PRI-D from Power Research. It is a additive that is used by fuel terminals and pipelines to keep diesel stabilized and prevent algae. Very reasonable cost since a little goes a long way. 1oz per 16 gallons of diesel.

I was getting a lot of algae growth in my fuel and I was having to change the primary filter in my Davco before 10,000 miles. Now, my filters stay good beyond 40,000 miles and the fuel looks like it just came out of the pump. That has to be better for my fuel system and injectors.

 

Tell me this. What does dpf stand for? "Diesel particulate filter". What is "Diesel particulate"? SOOT. the filter filters out soot. More sulfur, more soot. The sulfur plugs up the filter because its so much soot.

 

Yes, filters plug up because of too much soot, but its not the engine putting out the higher soot that causes that, its the fact that you will have no passive regeneration once the coating is eaten away from the sulphur. You poison it. Whether the engine puts out high or low soot, your NOx and temperatures will be too low once you ruin the coating. Soot burns off with NOx and temperature. The precious metal that the DPF and DOC is coated with converts your NO to NO2 and also increases temperature, preventing the soot from building up. Once the sulfur eats away at the coating, you get less heat, less NO conversion, and less "regeneration" wether its passive and eventually active regens too.

Once the sulphur deteriorates the coatings, your passive regeneration gets less and less. eventually parked regens may not work either.

This is the reason most 2010 trucks with scr don't do regenerations, the engine out NOx is bumped up. So there is less soot which means more NOx. when your NOx is higher coming out of the engine you need less temperature. But along with the higher NOx is higher temps anyway, so its rare to even load the filter. Even on the 2010 trucks if you run high sulphur fuel, you can see higher soot output from the engine, but its the long term effect of the sulphur killing the catalysts that will hurt you.

If you ran a tank of >500ppm. You'll be fine (except EPA would be pissed off ) . But keep doing that over and over, and you will ruin the filter and DOC. A lot of people will claim they have run high sulphur fuel in an 07 or newer truck and they were fine. And after one tank you won't notice any difference with regenerations.